--- /dev/null
+package org.apache.lucene.analysis.br;
+
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import java.io.File;
+import java.io.IOException;
+import java.io.Reader;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+import org.apache.lucene.analysis.Analyzer;
+import org.apache.lucene.analysis.CharArraySet;
+import org.apache.lucene.analysis.LowerCaseFilter;
+import org.apache.lucene.analysis.KeywordMarkerFilter;
+import org.apache.lucene.analysis.StopFilter;
+import org.apache.lucene.analysis.StopwordAnalyzerBase;
+import org.apache.lucene.analysis.TokenStream;
+import org.apache.lucene.analysis.Tokenizer;
+import org.apache.lucene.analysis.WordlistLoader;
+import org.apache.lucene.analysis.standard.StandardAnalyzer;
+import org.apache.lucene.analysis.standard.StandardFilter;
+import org.apache.lucene.analysis.standard.StandardTokenizer;
+import org.apache.lucene.util.IOUtils;
+import org.apache.lucene.util.Version;
+
+/**
+ * {@link Analyzer} for Brazilian Portuguese language.
+ * <p>
+ * Supports an external list of stopwords (words that
+ * will not be indexed at all) and an external list of exclusions (words that will
+ * not be stemmed, but indexed).
+ * </p>
+ *
+ * <p><b>NOTE</b>: This class uses the same {@link Version}
+ * dependent settings as {@link StandardAnalyzer}.</p>
+ */
+public final class BrazilianAnalyzer extends StopwordAnalyzerBase {
+
+ /**
+ * List of typical Brazilian Portuguese stopwords.
+ * @deprecated use {@link #getDefaultStopSet()} instead
+ */
+ @Deprecated
+ public final static String[] BRAZILIAN_STOP_WORDS = {
+ "a","ainda","alem","ambas","ambos","antes",
+ "ao","aonde","aos","apos","aquele","aqueles",
+ "as","assim","com","como","contra","contudo",
+ "cuja","cujas","cujo","cujos","da","das","de",
+ "dela","dele","deles","demais","depois","desde",
+ "desta","deste","dispoe","dispoem","diversa",
+ "diversas","diversos","do","dos","durante","e",
+ "ela","elas","ele","eles","em","entao","entre",
+ "essa","essas","esse","esses","esta","estas",
+ "este","estes","ha","isso","isto","logo","mais",
+ "mas","mediante","menos","mesma","mesmas","mesmo",
+ "mesmos","na","nas","nao","nas","nem","nesse","neste",
+ "nos","o","os","ou","outra","outras","outro","outros",
+ "pelas","pelas","pelo","pelos","perante","pois","por",
+ "porque","portanto","proprio","propios","quais","qual",
+ "qualquer","quando","quanto","que","quem","quer","se",
+ "seja","sem","sendo","seu","seus","sob","sobre","sua",
+ "suas","tal","tambem","teu","teus","toda","todas","todo",
+ "todos","tua","tuas","tudo","um","uma","umas","uns"};
+
+ /** File containing default Brazilian Portuguese stopwords. */
+ public final static String DEFAULT_STOPWORD_FILE = "stopwords.txt";
+
+ /**
+ * Returns an unmodifiable instance of the default stop-words set.
+ * @return an unmodifiable instance of the default stop-words set.
+ */
+ public static Set<?> getDefaultStopSet(){
+ return DefaultSetHolder.DEFAULT_STOP_SET;
+ }
+
+ private static class DefaultSetHolder {
+ static final Set<?> DEFAULT_STOP_SET;
+
+ static {
+ try {
+ DEFAULT_STOP_SET = WordlistLoader.getWordSet(IOUtils.getDecodingReader(BrazilianAnalyzer.class,
+ DEFAULT_STOPWORD_FILE, IOUtils.CHARSET_UTF_8), "#", Version.LUCENE_CURRENT);
+ } catch (IOException ex) {
+ // default set should always be present as it is part of the
+ // distribution (JAR)
+ throw new RuntimeException("Unable to load default stopword set");
+ }
+ }
+ }
+
+
+ /**
+ * Contains words that should be indexed but not stemmed.
+ */
+ // TODO make this private in 3.1
+ private Set<?> excltable = Collections.emptySet();
+
+ /**
+ * Builds an analyzer with the default stop words ({@link #getDefaultStopSet()}).
+ */
+ public BrazilianAnalyzer(Version matchVersion) {
+ this(matchVersion, DefaultSetHolder.DEFAULT_STOP_SET);
+ }
+
+ /**
+ * Builds an analyzer with the given stop words
+ *
+ * @param matchVersion
+ * lucene compatibility version
+ * @param stopwords
+ * a stopword set
+ */
+ public BrazilianAnalyzer(Version matchVersion, Set<?> stopwords) {
+ super(matchVersion, stopwords);
+ }
+
+ /**
+ * Builds an analyzer with the given stop words and stemming exclusion words
+ *
+ * @param matchVersion
+ * lucene compatibility version
+ * @param stopwords
+ * a stopword set
+ */
+ public BrazilianAnalyzer(Version matchVersion, Set<?> stopwords,
+ Set<?> stemExclusionSet) {
+ this(matchVersion, stopwords);
+ excltable = CharArraySet.unmodifiableSet(CharArraySet
+ .copy(matchVersion, stemExclusionSet));
+ }
+
+ /**
+ * Builds an analyzer with the given stop words.
+ * @deprecated use {@link #BrazilianAnalyzer(Version, Set)} instead
+ */
+ @Deprecated
+ public BrazilianAnalyzer(Version matchVersion, String... stopwords) {
+ this(matchVersion, StopFilter.makeStopSet(matchVersion, stopwords));
+ }
+
+ /**
+ * Builds an analyzer with the given stop words.
+ * @deprecated use {@link #BrazilianAnalyzer(Version, Set)} instead
+ */
+ @Deprecated
+ public BrazilianAnalyzer(Version matchVersion, Map<?,?> stopwords) {
+ this(matchVersion, stopwords.keySet());
+ }
+
+ /**
+ * Builds an analyzer with the given stop words.
+ * @deprecated use {@link #BrazilianAnalyzer(Version, Set)} instead
+ */
+ @Deprecated
+ public BrazilianAnalyzer(Version matchVersion, File stopwords)
+ throws IOException {
+ this(matchVersion, WordlistLoader.getWordSet(
+ IOUtils.getDecodingReader(stopwords, IOUtils.CHARSET_UTF_8), matchVersion));
+ }
+
+ /**
+ * Builds an exclusionlist from an array of Strings.
+ * @deprecated use {@link #BrazilianAnalyzer(Version, Set, Set)} instead
+ */
+ @Deprecated
+ public void setStemExclusionTable( String... exclusionlist ) {
+ excltable = StopFilter.makeStopSet( matchVersion, exclusionlist );
+ setPreviousTokenStream(null); // force a new stemmer to be created
+ }
+ /**
+ * Builds an exclusionlist from a {@link Map}.
+ * @deprecated use {@link #BrazilianAnalyzer(Version, Set, Set)} instead
+ */
+ @Deprecated
+ public void setStemExclusionTable( Map<?,?> exclusionlist ) {
+ excltable = new HashSet<Object>(exclusionlist.keySet());
+ setPreviousTokenStream(null); // force a new stemmer to be created
+ }
+ /**
+ * Builds an exclusionlist from the words contained in the given file.
+ * @deprecated use {@link #BrazilianAnalyzer(Version, Set, Set)} instead
+ */
+ @Deprecated
+ public void setStemExclusionTable( File exclusionlist ) throws IOException {
+ excltable = WordlistLoader.getWordSet(
+ IOUtils.getDecodingReader(exclusionlist, IOUtils.CHARSET_UTF_8), matchVersion);
+ setPreviousTokenStream(null); // force a new stemmer to be created
+ }
+
+ /**
+ * Creates
+ * {@link org.apache.lucene.analysis.ReusableAnalyzerBase.TokenStreamComponents}
+ * used to tokenize all the text in the provided {@link Reader}.
+ *
+ * @return {@link org.apache.lucene.analysis.ReusableAnalyzerBase.TokenStreamComponents}
+ * built from a {@link StandardTokenizer} filtered with
+ * {@link LowerCaseFilter}, {@link StandardFilter}, {@link StopFilter}
+ * , and {@link BrazilianStemFilter}.
+ */
+ @Override
+ protected TokenStreamComponents createComponents(String fieldName,
+ Reader reader) {
+ Tokenizer source = new StandardTokenizer(matchVersion, reader);
+ TokenStream result = new LowerCaseFilter(matchVersion, source);
+ result = new StandardFilter(matchVersion, result);
+ result = new StopFilter(matchVersion, result, stopwords);
+ if(excltable != null && !excltable.isEmpty())
+ result = new KeywordMarkerFilter(result, excltable);
+ return new TokenStreamComponents(source, new BrazilianStemFilter(result));
+ }
+}
+
fnp / pylucene.git / blobdiff